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ajserrano ajserrano is offline
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Join Date: Sep 2002
Location: Southern California, USA
Posts: 1,265
Originally Posted by tom1394racing View Post
Can anyone identify these 80mm pistons?

They appear to be more aggressive than any of the 2.0 S pistons I've seen.

They look like the 906/910 racing pistons on page 140 in BA's book.

Can anyone help?
Hi Tom! Hope all is well. While looking for a couple of used 906 pistons myself, I came across your old post here. The way to best identify your MAHLE pistons is by their casting number.

MAHLE 906 Piston = 80P24 and/or 80P24 W1

MAHLE 911S (69) Piston = 80P26 E

I included the 69S because most forum posts I come across are erronously describing the 69S pistons as "906" when in fact they are not.

If by chance you do have some 80mm pistons with the MAHLE 80P24 casting number, please let me know if those are available for sale, I'm interested.
I'm currently trying to complete one or two sets and need some 906 pistons that are within the same weight group. See below...

This is my current inventory of MAHLE 906 Pistons and Alloy Cylinders.

Now look at the bottom row, I have identified five 906 pistons that are very close within the same weight group, I need to be within one gram from each other (ideally). Less material can be removed from the steel wrist pin to get closer to a match, but removing aluminum from the piston itself takes a whole lot more milling for just one gram which can compromise the integrety and reliability of the component.

The 906 MAHLE Casting Number 80P24 variation...

another 906 piston, same casting number...

Below are some details for an OEM NOS set of 69' 911S MAHLE pistons, the ones that most often get misslabeled as 906. This is a bit frustrating when you see it all over the boards.

(photo courtesy of Phil Hindley, UK)

Now my used set of 69S' 80mm MAHLE pistons, same casting number as Phil's...

One-Year ONLY 1969 Porsche 911S / MAHLE Casting # 80P26 E

Hope this helps some... AJSERRANO at MSN dot COM
1970 Porsche 914/6 GT > Recreation in progress...
1970 Porsche 914/6 > Crashed, driving while sleeping (not good!)
1974 Porsche 911 Carrera > Stolen, recovered in pieces

Last edited by ajserrano; 07-17-2014 at 11:02 AM..
Old 07-13-2014, 08:54 PM
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